#include <fstream>
#include <cmath>
using namespace std;
ifstream cin("tg.in");
ofstream cout("tg.out");
long long a, b, c, rez, n;
int main()
{
    cin >> n;
    for (c = 2; c <= n; ++c)
    {
        for (a = c - 1; a >= 1; --a)
        {
            b = a * c;
            if (sqrt(b) == (int)sqrt(b))
                ++rez;
        }
    }
    cout << rez;
    return 0;
}